<!DOCTYPE html>
<style>
table {
  position:relative;
  top: 180px;
}
td {
  width: 50px;
  height: 50px;
}
</style>
<table>
  <tr>
    <td rowspan="2">1,1</td>
    <td>1,4</td>
  </tr>
  <tr>
    <td>2,3</td>
  </tr>
  <tr>
    <td rowspan="2" style="background-color: green">3,1</td>
    <td style="background-color: green">3,4</td>
  </tr>
  <tr>
    <td>4,4</td>
  </tr>
</table>
